There is a new zapper on the market called a Thundervolt zapper. Thundervolts have two handholds and two footpads, but they are NOT hard wired-they plug into the device, and are interchangeable. This allows for X body mixed zapping. Thundervolts have four frequencies, but one is body-activated. A special circuit "senses" the condition of the user, and adjusts the fourth frequency to match. The website informs the user how to easily test his or her state of body condition, so that a track record of gains in vitality may be documented when zapping. These zappers also utilize a higher level of positive offset, because this is crucial to avoiding below-ground spikes which make other zappers less effective. The author has found it advisable to cross-zap raw beef, chicken and pork to eliminate parasites before consumption-something proprietary to Thundervolt zappers. UPDATE: A Thundervolt zapper has reportedly eliminated Morgellon's and lyme disease.